Institutional Repository of Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height | |
Xu, Yongsheng1; Fu, Lee-Lueng2; Xu, YS (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China. | |
2012-12-01 | |
发表期刊 | JOURNAL OF PHYSICAL OCEANOGRAPHY |
ISSN | 0022-3670 |
卷号 | 42期号:12页码:2229-2233 |
文章类型 | Article |
摘要 | The wavenumber spectrum of sea surface height (SSH) observed by satellite altimetry was analyzed by Xu and Fu. The spectral shape in the wavelength range of 70-250 km was approximated by a power law, representing a regime governed by geostrophic turbulence theories. The effects of altimeter instrument noise were assumed insignificant at wavelengths longer than 70 km. The authors reexamined the assumption in the study. Using nearly simultaneous observations made by Jason-1 and Jason-2 during their cross-calibration phase, this study found that the white noise level of altimetry measurement was best estimated from the spectral values at wavelengths from 25 to 35 km. After removing a white noise level based on such estimate from the SSH spectrum, the spectral slope values changed significantly over most of the oceans. A key finding is that the spectral slopes are generally steeper than k(-2) (k is wavenumber) poleward of the 20 degrees latitudes, where flatter spectral slopes in some regions have previously caused problems for dynamic interpretations. The new results indicate that the spectral slopes in the core regions of the major ocean current systems have values between the original geostrophic turbulence theory and the surface quasigeostrophic theory. The near k(-4) spectrum suggests that the sea surface height variability at these wavelengths in the high eddy energy regions might be governed by frontogenesis. |
学科领域 | Oceanography |
DOI | 10.1175/JPO-D-12-0106.1 |
URL | 查看原文 |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000313054800009 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/12192 |
专题 | 海洋环流与波动重点实验室 |
通讯作者 | Xu, YS (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China. |
作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.CALTECH, Jet Prop Lab, Pasadena, CA USA |
第一作者单位 | 海洋环流与波动重点实验室 |
推荐引用方式 GB/T 7714 | Xu, Yongsheng,Fu, Lee-Lueng,Xu, YS . The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2012,42(12):2229-2233. |
APA | Xu, Yongsheng,Fu, Lee-Lueng,&Xu, YS .(2012).The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height.JOURNAL OF PHYSICAL OCEANOGRAPHY,42(12),2229-2233. |
MLA | Xu, Yongsheng,et al."The Effects of Altimeter Instrument Noise on the Estimation of the Wavenumber Spectrum of Sea Surface Height".JOURNAL OF PHYSICAL OCEANOGRAPHY 42.12(2012):2229-2233. |
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